SB2026072089 - Improper access control in Linux kernel smb client

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Main Vulnerability Database SB2026072089

SB2026072089 - Improper access control in Linux kernel smb client

Published: July 20, 2026

Security Bulletin ID SB2026072089
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-64137)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to affect service availability.

The vulnerability exists due to improper access control in the CIFS SWN netlink notify handler when sending witness notification commands. A local user can send crafted RESOURCE_CHANGE or CLIENT_MOVE notifications to affect service availability.

The intended sender is the cifs.witness helper, but any local process could send notifications to the in-kernel witness handler.


Remediation

Install update from vendor's website.

References